Question

Seno e cosseno de 11π/4

Answer 1

$\mathsf{\dfrac{11\pi}{4}=\dfrac{8\pi}{4}+\dfrac{3\pi}{4}=2\pi+\dfrac{3\pi}{4}}$

$\mathsf{sen(\dfrac{11\pi}{4})=sen(\dfrac{3\pi}{4})=\dfrac{\sqrt{2}}{2}}$

$\mathsf{cos(\dfrac{11\pi}{4})=cos(\dfrac{3\pi}{4})</p><p>=-\dfrac{\sqrt{2}}{2}}$